In Relation puzzle type, mutual blood relations or other information of more than two persons are mentioned and information about any two is mentioned.
A is the son of B.
C, B`s sister has a son D and a daughter E.
F is the maternal uncle of D.
How is E related to F ?
E is the daughter of C and D is the son of C.
So, F, who is the maternal uncle of D, is also the maternal uncle of E.
Thus, E is the niece of F.